Problems with the T-Method

Mathews, E.H.; Claassen, D.T.

doi:10.1016/s0360-1323(97)00033-4

Cited by 11 publications

(10 citation statements)

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“…Sizing the ductwork is applied from the assumed variables and the estimated design flow rate in every section. Although the methods are straightforward, they hardly obtain a balanced design system [46]- [48]. Moreover, the resulting designs do not consider prevailing local economic conditions.…”

Section: Conventional Methods (Non-optimization)mentioning

confidence: 99%

“…Only two junction nodes were included in the applied energy equation. Mathews et al [46] find that using the energy equation between only two junction nodes is biased and an ineffective alternative and suggested applying it on an appropriate control volume. The latest proved, on a proper control volume, that the energy equation's application does not provide an explicit expression for the static pressure regain across a junction, in contrast to Tsal and Behls' findings.…”

Section: Conventional Methods (Non-optimization)mentioning

confidence: 99%

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Improving HVAC Ductwork Designs While Considering Fittings at an Early Stage

Kabbara

Jorens

Ahmadian

et al. 2023

Preprint

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Section: Conventional Methods (Non-optimization)mentioning

confidence: 99%

Section: Conventional Methods (Non-optimization)mentioning

confidence: 99%

Improving HVAC Ductwork Designs While Considering Fittings at an Early Stage

Kabbara

Jorens

Ahmadian

et al. 2023

Preprint

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“…However, T-method offers poor control of flow velocity or duct diameter. When there are too many limitations, Mathews and Claassen [4] indicated that it is difficult to obtain the satisfactory optimal solution from T-method. Shiu et al [5] proposed dynamic programming method for the exhaust duct system design.…”

Section: Introductionmentioning

confidence: 99%

Process exhaust duct system design in a semiconductor factory using feedback simulation method

Chen

Shen

2010

2010 International Symposium on Computer, Communication, Control and Automation (3CA)

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Conventional duct design methods either fail to achieve pressure balance and ignore energy conservation in the actual running process. A feedback simulation method that contains system simulation and correction procedure is proposed. An acidity gas exhaust system in a semiconductor factory is presented in this study to understand the characteristics of the proposed method. The results demonstrate that the feedback simulation method improves efficiency of duct system design and facilitates the pressure balance of an exhaust duct system. It also provides the energy conservation strategies for the actual operating condition during the design stage.

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“…Mathews et al [6] showed that the T-Method had a problem when calculating minor loss coefficients at junctions and crosses, because minor loss coefficients are referenced to the dynamic pressure of adjacent duct sections. Therefore, the T-Method became unstable and produced grossly oversized ducts.…”

Section: Introductionmentioning

confidence: 99%

A Modified T-Method Simulation for Multi-fan Duct Systems

Moon¹,

Lee²,

Moon³

et al. 2006

Indoor and Built Environment

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In this study, we introduce the Modified T-Method which can be applied to the prediction of the flow distribution in multi-fan duct systems. Introduction of individual flow routes enables the division of a complicated multi-fan ductwork into a set of simultaneous single-fan subsystems. The present method was tested on the single-fan duct system presented in the ASHRAE handbook. The test system consisted of several branches and a fan. Our results showed good agreement with those published. Also, we tried another approach, in which the symmetry of a two-fan duct system was investigated. Verification was accomplished successfully by the analysis of a two-fan duct system that yielded physical consistency. In order to evaluate the utility and capability of the title method, a bathroom ventilation system in a 20-storey residential building was selected as an example of an application. Under the typical design conditions, the air flow rate of each exhaust fan at the balance point was predicted

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Problems with the T-Method

Cited by 11 publications

References 0 publications

Improving HVAC Ductwork Designs While Considering Fittings at an Early Stage

Improving HVAC Ductwork Designs While Considering Fittings at an Early Stage

Process exhaust duct system design in a semiconductor factory using feedback simulation method

A Modified T-Method Simulation for Multi-fan Duct Systems

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